diff mbox series

[1/2] m68k/nommu: add missing definition of ARCH_PFN_OFFSET

Message ID 20230214140729.1649961-2-rppt@kernel.org (mailing list archive)
State New
Headers show
Series fixups for generic implementation of pfn_valid() | expand

Commit Message

Mike Rapoport Feb. 14, 2023, 2:07 p.m. UTC 
From: "Mike Rapoport (IBM)" <rppt@kernel.org>

On m68k/nommu RAM does not necessarily start at 0x0 and when it does not
pfn_valid() uses a wrong offset into the memory map which causes silent
boot failures.

Define ARCH_PFN_OFFSET to make pfn_valid() use the correct offset.

Reported-by: Guenter Roeck <linux@roeck-us.net>
Fixes: d82f07f06cf8 ("m68k: use asm-generic/memory_model.h for both MMU and !MMU")
Signed-off-by: Mike Rapoport (IBM) <rppt@kernel.org>
---
 arch/m68k/include/asm/page_no.h | 2 ++
 1 file changed, 2 insertions(+)

Comments

Greg Ungerer Feb. 15, 2023, 12:16 p.m. UTC | #1 
On 15/2/23 00:07, Mike Rapoport wrote:
> From: "Mike Rapoport (IBM)" <rppt@kernel.org>
> 
> On m68k/nommu RAM does not necessarily start at 0x0 and when it does not
> pfn_valid() uses a wrong offset into the memory map which causes silent
> boot failures.
> 
> Define ARCH_PFN_OFFSET to make pfn_valid() use the correct offset.
> 
> Reported-by: Guenter Roeck <linux@roeck-us.net>
> Fixes: d82f07f06cf8 ("m68k: use asm-generic/memory_model.h for both MMU and !MMU")
> Signed-off-by: Mike Rapoport (IBM) <rppt@kernel.org>

Acked-by: Greg Ungerer <gerg@linux-m68k.org>


> ---
>   arch/m68k/include/asm/page_no.h | 2 ++
>   1 file changed, 2 insertions(+)
> 
> diff --git a/arch/m68k/include/asm/page_no.h b/arch/m68k/include/asm/page_no.h
> index 43ff6b109ebb..060e4c0e7605 100644
> --- a/arch/m68k/include/asm/page_no.h
> +++ b/arch/m68k/include/asm/page_no.h
> @@ -28,6 +28,8 @@ extern unsigned long memory_end;
>   #define	virt_addr_valid(kaddr)	(((unsigned long)(kaddr) >= PAGE_OFFSET) && \
>   				((unsigned long)(kaddr) < memory_end))
>   
> +#define ARCH_PFN_OFFSET PHYS_PFN(PAGE_OFFSET_RAW)
> +
>   #endif /* __ASSEMBLY__ */
>   
>   #endif /* _M68K_PAGE_NO_H */
David Hildenbrand Feb. 16, 2023, 12:55 p.m. UTC | #2 
On 14.02.23 15:07, Mike Rapoport wrote:
> From: "Mike Rapoport (IBM)" <rppt@kernel.org>
> 
> On m68k/nommu RAM does not necessarily start at 0x0 and when it does not
> pfn_valid() uses a wrong offset into the memory map which causes silent
> boot failures.
> 
> Define ARCH_PFN_OFFSET to make pfn_valid() use the correct offset.
> 
> Reported-by: Guenter Roeck <linux@roeck-us.net>
> Fixes: d82f07f06cf8 ("m68k: use asm-generic/memory_model.h for both MMU and !MMU")
> Signed-off-by: Mike Rapoport (IBM) <rppt@kernel.org>
> ---

Reviewed-by: David Hildenbrand <david@redhat.com>
diff mbox series

Patch

diff --git a/arch/m68k/include/asm/page_no.h b/arch/m68k/include/asm/page_no.h
index 43ff6b109ebb..060e4c0e7605 100644
--- a/arch/m68k/include/asm/page_no.h
+++ b/arch/m68k/include/asm/page_no.h
@@ -28,6 +28,8 @@  extern unsigned long memory_end;
 #define	virt_addr_valid(kaddr)	(((unsigned long)(kaddr) >= PAGE_OFFSET) && \
 				((unsigned long)(kaddr) < memory_end))
 
+#define ARCH_PFN_OFFSET PHYS_PFN(PAGE_OFFSET_RAW)
+
 #endif /* __ASSEMBLY__ */
 
 #endif /* _M68K_PAGE_NO_H */